immune system

noun

: the bodily system that protects the body from foreign substances, cells, and tissues by producing the immune response and that includes especially the thymus, spleen, lymph nodes, special deposits of lymphoid tissue (as in the gastrointestinal tract and bone marrow), macrophages, lymphocytes including the B cells and T cells, and antibodies

Examples of immune system in a Sentence

Recent Examples on the Web

In a fair fight, the immune system would wipe out cancer every time – but this crafty disease doesn’t play fair. —Michael Irving, New Atlas, 20 Sep. 2024

They’ve been shown to cause cancer in animals along with having serious effects on the immune system, reproductive system, nervous system, endocrine system and other effects. —Erik S. Hanley, Journal Sentinel, 19 Sep. 2024

Children, pregnant or lactating people, or people with weakened immune systems should not consume kombucha. —Allison Herries, Verywell Health, 18 Sep. 2024

Women with weak immune systems, including those undergoing chemotherapy, are advised to avoid probiotics. —Lainey Younkin, Ms, Rd, Health, 16 Sep. 2024

Word History

First Known Use

circa 1919, in the meaning defined above

Kids Definition

immune system

noun

: the bodily system that protects the body from foreign substances, cells, and tissues by producing the immune response and that includes especially the thymus, spleen, lymph nodes, lymphocytes, and antibodies

Medical Definition

immune system

noun

: the bodily system that protects the body from foreign substances, cells, and tissues by producing the immune response and that includes especially the thymus, spleen, lymph nodes, special deposits of lymphoid tissue (as in the gastrointestinal tract and bone marrow), lymphocytes including the B cells and T cells, and antibodies